Mixed-gender relays will make their Olympic debut at Tokyo 2020.
The U.S. is clearly ready.
Two American quartets combined to lower the mixed 4x100m medley relay world record by 3.15 seconds at the world championships in Budapest on Wednesday.
Matt Grevers, Lilly King, Caeleb Dressel and Simone Manuel won the final by 2.65 seconds over Australia, keeping the Aussies without a gold through four of seven days at worlds.
Earlier, Ryan Murphy, Kevin Cordes, Kelsi Worrell and Mallory Comerford broke Great Britain’s world record in the preliminary heats.